Governor control of steam-engine valves.



E. F. WILLIAMS.

GOVERNOR CONTROL OF STEAM ENGINE VALVES.

APPLICATION FILED DEO.,16, 1912.

Patented Aug. 12, 1913,.

2 BHEET8-SHEET 1.

[/9 z/z r yZiar xpdsse/s E. P. WILLIAMS. GOVERNOR CONTROL OF STEAM ENGINE VALVES.

APPLICATION FILED DEC. 16, 1912. 1,069,990. Patented Aug. 12,1913. 2 snnms-snnm 2.

EDWIN F. WILEIAHS,

15' 33 E, PE S AE eovnnnos. WN'IRBIJ or stumnwown VALVES.

. Specification of Letters l'qtent.

Applica ion fi ed December 1 2- r l o. 737,126-

Patented Aug- 13, 1913.

To all whom it may concern.

Be t known that I, EDWIN F. WILLIAMS, 1; cltizen of the United Stat residi at Erie, 1n the county of Erie and State of Pennsylvania, have invent d certaln new and useful Improvements i Governor Cou trol of Steam'Engine Valves, of Which the following is a specification- .This invention relates to valve gear f0? steam engines, and comprises a govern r 01 such valve, where one valve controls the admission and the exhaust.

A serious objection to ordinary shaft governor control of a single valve is that at the shorter cut otfs the exhaust action is ad vanced to such an extent that compression becomes excessivaunless the cylinder clear ance is too large for very good economy in the use of steam. It is desirable for various reasons to use a single valve for both of the functions referred to, and it i8 also de sirable to have small cylind r clearance for steam economy. The ordinary governor and shifting eccentric does not admit of short cylinder clearance-with a single valve,

The object of the invention is to provide a construction attended with the advantages referred to. The device provides for the movement of a valve under governor control for retarding the exhaust action at various or all periods of admission. It, delays, or causes a later exhaust action than would occur at the same cut-oil with an ordinary governor mechanism, The invention provides a variable cut-off governor control, in connection with a delayed exhaust.

In the accompanying drawings-Figure 1 is a side elevation of the governor mechanism. Fig. 2 is a sectional'view on the line 22 of Fig. 1. Fig. 3 is a side elevation opposite to Fig. 1. Fig. 4 is a side elevation, partly in section, illustrating the valve gear connected to a single piston valve controlling the separate inlet and outlet ports.

In the drawings, A is the eccentric arm or lever pivoted to the fly wheel 6 at R, and pivotally connected to and acted on at the other end by a toggle link C, D, E pivoted to the lever J which carries the weight I, said lever being pivoted on a sleeve F which is fastened to one of the fly wheel spokes by nut P. The driving pin B projects from the eccentric arm A and operates the eccentric rod 7.

N is a fixed eccentric which is attached to the engine frame 8, and O is an eccentric strap mounted thereon and pivo d t on end of a l'flGkBljlIIll G, pro ecting from a rock haft L whi h 18 m unted in a bearing on one of the fly wheel spokes and extends across the same to the opposite side of the wheel, here h Shaft L carries an arm H at i s oth r end- The shaft L ex n through the sleeve F which forms the bearmg for the same. The arm H is connected by a l nk K o the toggle joint D, i

The eccentricity of the fixed eccentric N is a approxi a ely wr ght an In to th c ntri r d. and at each revo u ion of the mam shaft or fly wheel the action of the eccentr c N by means of the rock shaft L and its arms G and H causes the togg e t0, flex at i elbow D, t ere y sh ening he di tance between th pcm s G and E a certain t, twice or e ch r volution of the g v rnor. The distance betwe n th n 0 an E of the togg e is alway h r es v when the a ve is approx mately a half av l e ther r arder ack b au a stated, the eccentrle is appro imately at a mghtang e o the line f mo em nt f the eccen ri rod- As the exhaust a evspp ns and clo s at mid stroke of the val e 1t W111 be seen that at the time of exhaust the eccen ric arm A is hrown back, in a position it would otherwise occupy with the cilt-ofi at a later point of the piston stroke, thereby causing a dwell or delay in the movement of the valve. In this manner there is obtained a variable cut-ofi', with a delayed exhaust action throughout the range of the governor.

In Fig. 4, the governor is shown applied to a steam engine having a single valve 9 located directly under the bore of the cylinder and controlling at its opposite ends the inlet ports 10 to the cylinder and the outlet ports 12 to the middle exhaust passage 13. Obviously the valve may be located in any other suitable position, The exhaust ports 12 are spaced from the cylinder heads a sufii cient distance to secure a desired amount of compression when closed by the piston running over them. When such avalve is combined with the governor mechanism shown there is secured a constantpoint of exhaust closure and a constant compression in the cylinder, the steam being admitted and exhausted by asingle valve which controls the independent inlet and outlet ports and is operated by the governor. With such a valve the governor produces a delayed exhaust action without correspondingly delaying the point ofcut-off, and the movement is also hastened at the time of steam admission, giving quicker. admission and a sharper cut-ofi' than would otherwise occur. This feature of accelerated admission is present, although it is not as important to the desired result as the delayed exhaust.

What I claim as new is:

l. The combination with a shiftable valveoperating eccentric, and means to shift the same, of a fixed eccentric, and means actuated thereby to vary the shift of the first mentioned eccentric.

2. The combination with a wheel, a shiftable valve-operating eccentric carried thereby and rotating therewith, and means to ,shift said eccentric, of means including a fixed eccentric to periodically vary the shift of said valve-operating eccentric.

3. The combination with a wheel, a lever carried thereby and provided with an eccentric connect-ion adapted to operate a valve,

and means actuated by the rotation of the wheel to shift the. lever, of a fixed eccentric located besidethe wheel, and means actuated thereby to eriod-ically vary the position of the lever, uring such rotation.

4. The combination with a wheel, a shiftable valve-operating eccentric carried thereby, a weighted lever carried b the wheel and actuated by rotation thereo and a connection between said lever and eccentric to shift the latter by movement of the former, of means to' periodically vary the effective length of said connection and thereby modify the shift of said eccentric, during the rotation of the wheel.

5. The combination with a wheel, a shiftable valve-operating lever carried by said wheel, a weighted lever carried by the wheel and actuated by rotation thereof to shift the said lever, and a jointed connecting link between the levers, of auxiliary means to pcriodically flex the link at said joint and thereby vary its effective length, during the rotation of the wheel.

6. The combinationwith a wheel, a shiftable valve-operating lever carried by said wheel, a weighted lever carried by the wheel, and a jointed connecting link between the levers, of a fixed eccentric beside the wheel, an eccentric strap thereon carried by the wheel, and a connection between said strap and the link, adapted to flex the latter and vary its effective length.

7. The combination of a wheel, a shiftable valve-operating eccentric carried thereby, a weighted lever carried by the wheel, a toggle connecting the eccentric and the lever a rocker carried by the wheel and connected to the toggle and adapted to flex the latter, and a fixed member located beside the wheel and an operating connection between said member and the rocker, adapted to periodically actuate the latter during the rotation of the wheel.

In testimony whereof, I do aflixmy signature in presence of two witnesses.

EDWIN F. WILLIAMS.

Witnesses:

CHARLES G. BREVILLIER, M. LEVANT DAVIS. 

